THE CONSTITUTIONAL DUTIES OF THE STATE: THE CONCEPT, THE HISTORY OF THE DEVELOPMENT, A PROBLEM AND REALIZATION PROSPECTS Modern mutual relations of the state and the citizen are built on the basis of bilaterial communication where the rights and duties of each party correspond. <...> Each right is provided with a duty of the opposite participant to execute promised or established, and, accordingly, any duty of the subject of legal communication means presence of the counterpart, having the right to demand realisation of legitimate rights. <...> The similar concept it is put in bases of the constitutional system of the majority of the countries of the world, being embodied in principles democratic, social, a lawful state. <...> In this context, the separate a ention is deserved by a question of studying of essence of the constitutional duties of the state. <...> K e y w o r d s: the state, the citizen, the rights and duties, the competence, realisation of powers, the constitutional system. <...> Каждое право обеспечивается обязанностью противоположного участника исполнить обещанное или установленное, и, соответственно, любая обязанность субъекта правоотношения подразумевает наличие управомоченной стороны, имеющей право требовать реализации законных прав. <...>